Twin Star Exorcists Onmyoji Vol 7

Rokuro dreams of becoming anything but an exorcist! Then mysterious Benio turns up. The pair are dubbed the "Twin Star Exorcists" and learn they are fated to marry... Can Rokuro escape both fates?
Paradoxically, Rokuro's Spiritual Guardian appears to be someone it can't possibly be. Then, despite warnings, Guardian Shimon recruits the Twin Stars to help him rescue a young exorcist in training. Now why does Seigen add his daughter, newbie exorcist Mayura, to their team...?